[Chugalug] Phybridge

Dave Brockman dave at brockmans.com
Wed Oct 2 21:13:55 UTC 2013


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On 10/2/2013 4:09 PM, Jeremy Gault, KD4NED wrote:
> Long time lurker, figured it was time to post... :P
> 
> Anyone out there had experience with this "Phybridge" product that 
> supposedly provides Ethernet over a single wire pair?  Someone
> mentioned it to me as a possible solution for some VoIP
> installations, but I'm skeptical... I figure that Ethernet uses two
> pairs for a reason, and attempting to consolidate it into one pair
> might just be asking for trouble... much like trying to do
> single-pair T1's back in the day?
> 
> Should I run, not walk, away from said product?
> 
> Jeremy

It looks like an extension of Cisco's LRE (Long Reach Ethernet).
Personally, I wouldn't touch it with a 10ft pole and John Aldrich
holding the pole.  You will also require an adapter in front of every
device you want to connect this thing to (to translate
phybridge-fake-ethernet into real Ethernet so it pins out correctly
into the device you are connecting).  Just because 10/100bT only uses
two pairs to transmit, your cabling is NOT up to spec if you don't use
all four pairs.

I should also add the disclaimer that anything in this day and age
that places the words proprietary and network next to one another
should DIAF, very slowly, and very painfully.  It literally took us 2
decades to actually get all the vendors in the networking world to
play nicely together.  I do not in any way support back-sliding 20+
years to networking of the late 80's and early 90's.

Regards,

dtb
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